Requirements:
python (2.5+ required, 2.7 recommended*, 3.0+ not tested)
python-irclib (8.0.1 | 8.5.3)

* 2.7 for this fix: http://bugs.python.org/issue8117

Install:
Copy sample_config.py to what will be the bot's working directory and rename to config.py . Edit config.py to customize your bot.

Starting the bot:
If the working directory is different from the script's use the -c option to specify the path.
Use -d to daemonize.

Writing modules:
Just write a child class of modules.IRCModule and give it event handler methods named "on_EVENT" where EVENT is any of the events generated by python-irclib. They are enumerated in irclib.py.
Name your class "IRCModule" or make a module member referencing your module class. (e.g. IRCModule = MyModuleClass)
Put the file in the modules directory and add the file's module name (the file name minus ".py") to the MODULES list in config.py .